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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Beginning balance at Dec. 31, 2013 $ 5,886 $ 10 $ 188,600 $ (178,875) $ (3,849)
Beginning balance, shares at Dec. 31, 2013   110,100,701      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock for milestone payment, other   3,000,000      
Issuance of common stock for milestone payment 6,840   6,840    
Issuance of common stock upon exercise of warrants, shares   5,467,027      
Issuance of common stock upon exercise of warrants 37,743 1 37,742    
Issuance of common stock in connection with employee stock purchase plan, shares   114,630      
Issuance of common stock in connection with employee stock purchase plan 263   263    
Stock based compensation for directors and employees 4,297   4,297    
Stock based compensation for services 138   138    
Exercise of stock options, shares 3,608,000 3,449,760      
Exercise of stock options 4,342   4,342    
Net loss (28,650)     (28,650)  
Ending balance at Sep. 30, 2014 $ 30,859 $ 11 $ 242,222 $ (207,525) $ (3,849)
Ending balance, shares at Sep. 30, 2014   122,132,118